FUNGI OF ICELAND 461 
Plowrightia ribesia | 
Leptosphaeria Ribis | 
Phoma ribicola 
Phomopsis ribesia | 
Br on Ribes rubrum 
Phoma Malvacei | him 
Hendersonia Ribis alpini |" P 
PSM RUD , 52.124257 - Rubus idaeus 
Cytospora leucostoma......... - Prunus padus 
Comarosporium laburnicum | 
Rabenhorstia rudis .. — Cytisus laburnum 
Coniothyrium Laburni | 
Phytophthora ee 
Paoma solanicola | 5:24 - Solanum tuberosum 
Fusarium Solani | 
Sphaerulina intermixta........ - Lonicera sp. 
I shall mention one more example of the recent immigration 
of a Boletopsis, which, similarly to that of the above-mentioned fungi, 
seems to have taken place simultaneously with the introduction of 
the plant with which its existence is intimately bound up. This is 
Boletopsis luteus. — In a small plantation in the birch copses near 
Hallormsstadir in E. Iceland, there is an area with 10—12 year 
old Pinus montana. Here for the first and only time in Iceland I 
found Boletopsis luteus. 
Upon inquiry the forester who had laid out the plantation 
informed me that none of these pines had been planted, but were 
all raised from imported seeds! In this case the most natural ex- 
planation of the occurrence of the fungi would seem to be that the 
spores were introduced with the seeds. 
1 In Bjorn Halldérsson’s Grasnytiar 1783, Boletus (Boletopsis) luteus is 
stated to be growing in Iceland. From here this statement has found its way into 
Mohr’s Islandsk Naturhistorie, 1786, and finally, with a reference to these sources, 
into Rostrup’s lists of Icelandic fungi. None of the numerous other botanists 
who have subsequently searched for fungi in Iceland have, as far as I know, ever 
seen any trace of this easily recognisable fungus. As moreover B. luteus forms 
mycorrhiza with coniferous trees only, these early statements cannot possibly be 
correct. 
